Janolus savinkini Martynov & Korshunova, 2012
- Location
- Okawa shita, Osezaki, Shizuoka, Japan
- Date
- 2017/08/29
- Length
- 15mm
- Depth
- 25.0m
- Water temperature
- 23.0℃
Description
A small to medium-sized janolid, body length up to 30 mm. The body is densely covered by at least 100 large, spindle-shaped, smooth papillae, often attenuated apically (juveniles bear only 30-40 papillae). The notum is completely reduced. The digestive gland is strongly branched and penetrates each papilla as a basal thickening with several narrow branches. Head small, with two short distinct oral tentacles. Rhinophores grouped together with oblique lamellae (up to 20 in adults; 10-15 in juveniles); the caruncle (inter-rhinophoral crest) is well defined with finely branched folds. Foot rounded, with anterior corners absent but strongly bilobed. The anus opens on the right posterior dorsal side. Ground colour creamy yellow with a light orange hue; papillae are the same colour throughout most of their length, with a broad purplish ring near the tip and a bright opaque-blue apical spot; the rhinophores share this colour pattern.Distribution
Type locality: Mun Island, Nha Trang Bay, Vietnam (22 m depth, sand). Photographic records also from Tre Island and Dung Island, Vietnam. Distributed across the tropical Indo-West Pacific, at 8-38 m depth on various substrata including soft grounds.Etymology
The specific epithet savinkini honours Oleg Savinkin (Institute of Problem of Evolution and Ecology, Moscow), who contributed for more than three decades to the study, collection and photographing of numerous marine invertebrate and vertebrate species of Vietnam's fauna.Remarks
Easily distinguished from previously described Janolus species by the unique colour pattern of yellow papillae with a broad purplish subapical band and an opaque-blue apical spot.References
- Janolus sp. 4 (Rudman 2001), Rudman W.B. (1998-2010). Sea Slug Forum. Australian Museum, Sydney. http://www.seaslugforum.net/
- トゲトゲウミウシ, 中野理枝. (2004). 本州のウミウシ. ラトルズ.
- トゲトゲウミウシ, 小野篤司. (2004). 沖縄のウミウシ. ラトルズ.
- Janolus sp. 7, Gosliner T.M., Behrens D.W. & Valdés Á. (2008). Indo-Pacific Nudibranchs and Sea Slugs: A field guide to the world's most diverse fauna. Sea Challengers Natural History Books, 426 pp.
- Janolus savinkini sp. nov., Martynov A.V. & Korshunova T.A. (2012). Opisthobranch molluscs of Vietnam (Gastropoda: Opisthobranchia). In: Britayev T.A. & Pavlov D.S. (Eds.). Benthic fauna of the Bay of Nhatrang, Southern Vietnam. Vol. 2. Moscow, KMK: 142-257.
- Janolus savinkini, Terrence Gosliner, Ángel Valdés and David Behrens. (2015). Nudibranch and Sea Slug Identification Indo-Pacific. New World Pubns Inc.
- Janolus spp., 中野理枝. (2019). 日本のウミウシ. 第二版. 文一総合出版.
- ヤノルス・サヴィンキンイ, 小野篤司 & 加藤昌一. (2020). 新版 ウミウシ. 誠文堂新光社.
Featured in this book
Terrence Gosliner, Ángel Valdés and David Behrens. (2018). Nudibranch and Sea Slug Identification Indo-Pacific 2nd Edition. New World Pubns Inc.
New World Publications
This species, Janolus savinkini, is included in the book.
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Photos of Janolus savinkini
Tag:
Same Genus Nudibranchs
Similar Colors Nudibranchs
Academic Database
Sea slug observation data is available in international marine biodiversity databases.